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/* $Id: msgqueue.h 319 2008-04-19 08:24:17Z eino.tuominen $ */
/*
* Copyright (c) 2006,2007
* Eino Tuominen <eino@utu.fi>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef MSGQUEUE_H
#define MSGQUEUE_H
typedef struct msg_s
{
void *msgp;
size_t msgsz;
struct msg_s *next;
struct timespec timestamp;
} msg_t;
typedef struct msgqueue_s
{
pthread_cond_t cv;
pthread_mutex_t mx;
msg_t *head;
msg_t *tail;
int msgcount;
struct msgqueue_s *delaypair;
const struct timespec *delay_ts;
int *impose_delay; /* both the queues point to the same int */
bool active;
int id;
} msgqueue_t;
typedef struct
{
msgqueue_t *inq;
msgqueue_t *outq;
} queue_info_t;
int get_queue(void);
int get_delay_queue(const struct timespec *ts);
int disable_delay(int msqid);
int enable_delay(int msqid);
int set_delay(int msqid, const struct timespec *ts);
int put_msg(int msqid, void *msgp, size_t msgsz, int msgflg);
int instant_msg(int msqid, void *msgp, size_t msgsz, int msgflg);
int release_queue(int msqid);
size_t get_msg(int msqid, void *msgp, size_t maxsize, int msgflag);
size_t get_msg_timed(int msqid, void *msgp, size_t maxsize, int msgflag, mseconds_t timeout);
size_t in_queue_len(int msgid);
size_t out_queue_len(int msgid);
int queue_freeze(int msgid);
int queue_thaw(int msgid);
int walk_queue(int msgid, int (*callback) (void *));
#endif /* MSGQUEUE_H */
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